linkedlisttest.c

#include <stdio.h>
#include <stdlib.h>


typedef struct _node {
	int value;
	struct _node *next;
} node;

void CheckNotNull(void *pointer);
node *BuildOneTwoThree();
void PrintList(node *head);

int main() {

	node *list = BuildOneTwoThree();
	PrintList(list);

	return 0;
}

node *BuildOneTwoThree() {
	node *head;

	head = (node *) malloc(sizeof(node));
	CheckNotNull(head);
	head->value = 1;

	head->next = (node *) malloc(sizeof(node));
	CheckNotNull(head->next);
	head->next->value = 2;

	head->next->next = (node *) malloc(sizeof(node));
	CheckNotNull(head->next->next);
	head->next->next->value = 3;

	head->next->next->next = NULL;

	return head;
}

void PrintList(node *head) {
	node *curr = head;

	while (curr != NULL) {
		printf("%d ", curr->value);
		curr = curr->next;
	}

	printf("\n");
}

void CheckNotNull(void *pointer) {
	if (pointer == NULL) {
		printf("Error: pointer is null.\n");
		exit(-1);
	}
}